Speed-indicating device



Patented Nov. 1, 1927.

UNITED STATESv P'A'lfiirirV oFFicE.,

ARTHUR IP; BRANT AND CHARLES M. DERBY, OF LITTLE VALLEY, NEW YOF'K.

srnEn-Iivnrcarne :onvicn Applicationled April `2, Serial No. 99,246.

This invention relates to certain new and useful improvements in speed indicating devices for rotary shafts and the like.

` It is quite easy and appliances are nowl available for indicating the speed of shafts by the application of such appliances to the end of the shaft, but where the end of the shaft is not exposed, or is otherwise unavailable for that purpose, it has been eX- tremely difficult to determine the rotary speed ofl a shaft, and the main object of this invention is the production of a speedindicating device applicableto an intermediate portion of ashaft, and by means of which the speed of a shaft may be readily indicated by the use of a usual device applicable to the free end -of a shaft, and this result is effected by driving a secondary or measuring shaft at the speed of or at a speedproportional to the speed of the shaft of which the speed is to be determined, the measuring shaft having a free end available for thev application of a usual speed indicator.'\"l Y v. Other objects and advantages relate to the details of the structure andV the form and relation ofthe parts thereof, all as will more fully appear from theffollowing description,

taken in connection with the accompanying drawings, in which: y

Figure' 1 is a side elevation of a device of this invention.

Figure 2 is a section on line 2-2,Fig ure l.

Figure 3 is a section on line 3-43, Figure 2.

Figure 4 is a section on line 4 4, Figure 1.

The device as here illustrated, comprises 40 a frame lincluding a longitudinally eX- tending tubular part -2-, within which the rack 30 isslidably ositioned. Bearing -3- extends laterally flfom the tubular part -`-2--V and bearing -40- extends rearwardly `at substantially right angles from the bearing -3-. y

Shaft 4- is journaled in the bearing --.-3- and carries near one end a friction wheel -ewhich may be formed with Aa rubber or other similar rim -60 if desired. Bevel gear 46,- is Vmountedon the other end of shaft -4- and is adapted to mesh with cooperating bevel gear -7`- pinned to the forward end of shaft f8- journaled'in bearing -40. The rear end of shaft -8- carries a friction wheel 9-7- preferably of the same diameter as the wheel -5- and secured to the shaft lfor, simul-` taneous rotation in any suitable manner, as by pin. The friction wheelf--f-V constitutes one of'the jaws adapted to engage a shaft -l0-, the speed of which is to be measured, and this jaw, altho free to rotate is fixed so far as movement independently of frame -l toward andfrom the shaft l0- is concerned. A movable jaw 3l` is provided which may, as shown, terminate in a rotary member or wheel l 12-- if desired, altho that is not essential. The jaw 3lis carried by a longitudinally movable rack .-125- slidablein brackets l3- and leicarried by the tubular part 2- of the frame -l-a The rack -30- carries a laterally-extending tubular bearing 15iwithin which shaft *16- is slidably and rotatably journaled, said shaft beingformed at one end with a part -17- for receiving an ordinary speed indicator, and provided at its opposite end `with av friction disk -l8-`-, spring -19- being interposed between .thev friction disk and the bearing f-15- so as to normally hold the friction disk in contact with the circumferential portion of the friction wheel -9. i

p The racks BO-fy and 12e-fare adapted to besimultaneo'usly driven in opposite directions by means of gears -20-' and-21-V respectively, the gear -21 being offa'diameter twice as great as the diameter of the gear -20- whereby the rack '-lv2,is shifted longitudinally a distance twice as great as the distance of movement of the rack i e.

80- when said gears are 'simultaneously rotated by means of shaft Q2-- to which the gears are secured as by pins. The shaft Q2-- is journaled in the opposite sides of the bracket -l3 and is adapted to be manually rotated by thumb Ypiece elif i i y i The racks l2- and 30- are initially so positioned that the distance between the jaws -5- and -3l equals twice the distance between the center of the friction disk -184 and the point of contact of the friction wheel -9- with said, disk. In' other words, the radius of the circle defined upon the disk 18% by frictionfwheel -9 when l rotated is equal to the radius of a shaft with which the jaws -5- and -31-- are in diametrical contact. Y

1t will be obvious, therefore, that upon rotation of a shaft -10- to be measured, 1

rotarymovement .will be transmitted to the friction wheel -5- and through shafts -4-, gears -6- and -7- and shaft -8- will be transferred to the friction disk -9-' at the same speed at which friction wheel -5- rotates. In view of the fact that the radius of the circle defined on disk -lBm by friction wheel -9- is equal to the radius of the shaft 10- movement will be transmitted to the friction disk 1S- and shaft at the same rotary speed as the speed of rotationv of shaft -`10-. As the end of shaft '-415- is readily available for the application of a usual speed indicator, its speed can 4be readily determined by known instruments, and thereby one may determine the speed of the shaft -10-, which is the same as the speed of the shaft -16-.

' The structure of this invention can be readily applied tothe intermediate portion of any shaft, and it is only necessary to apply therjaws '-5- and -81- tightly to a shaft, the speed of which lis toy be determined, indiam'et-rical positions by rotation of shaft f22- by thumbnut 2li- The speed of shaft 410'- will then be accurately indicatedv by an ordinary speed indica-tor applied to the free end of shaft 16-.

Additional means may be provided for helding' the jaws engaged with the shaft in diametric relation in the form of an angular bracket 1- 32- carrying contact member or rollerf 33 adapted tor engage the shaft. This bracket may be mounted upon a journal -135-'eXt'ending outwardly from ther frame -l-e and having its outer end threaded for receiving thumb nut S6- by which the bracket is heldin any of its adjusted positiens .withthecontact member engaging the surfaceof the shaft. y

Altho we have shown and describeda specific structure and form and relation of the larts thereof as illustrative of apresent preerred embodiment of the invention, we do net esire to restrict ourselves t'o the details of the 'structure or the exact form and relation of the parts thereof, as various changes may be made within the vscope of the appended claims.

We claim:

1. In a yspeed indicating device, a pair of jaw elements adapted to be disposed diametrically upon opposite sides of a shaft, the speed of which is to be measured, a measuring shaft, and means for driving the measuring shaft from one of the jaw 'elements'.

2. In a speed indicating device, a pair of jaw elements adapted toy be disposed diametrically upon opposite sides of a shaft, the speed of which is to be measured, a measuring shaft, and means for driving the measuring shaft from one of the aw elements at a speed equal to the speed of the shaft to be measured. v

3.A In a speed indicating device, a pair of jaw elements adapted to .be disposed diametrically upon opposite sides of a shaft, the speed of which is to be measured, a friction disk, means for driving said friction disk from one of the j aw elements, and a measuring shaft'driven by the friction disk.

4. In a speed indicating device, a pair of jaw elements adapted to be disposed diametrically upon opposite sides of a shaft, the Speed of which is to be measured, a friction disk, a friction wheel adapted to contact with said friction disk, means for driving said friction wheel from one of the jaw elements, and a measuring shaft driven by the friction disk. Y

5. In a speed indicating device, a pair of jaw elements adapted to be disposed diametrically upon opposite sides of a shaft, the speed'of whichl is tobe measured, a friction disk, a friction wheel adaptedto Contact with said friction disk, means for ,driving said friction wheel from one ofthe jaw elements, a measuring shaft driven by the friction disk, andfmeans for varying the position of the friction wheel radially of the friction disk as the distance between the jaws is varied;

6. In a speed-indicating device, va, pair of jaw elements adapted to be disposed dia-` metrically upon opposite sides of a shaft, the speed of which is to befmeasured, a sliding'rack carrying' one of said jaw ele'- ments, a second sliding rack, a shaft jour'- naled in the second sliding rack, a friction disk mounted on said shaft, a friction Wheel adapted to cont-act with the'friction disk, means for driving said friction wheel from one of said ja'w elements, and means for moving said racks simultaneously.

7. In a speedsindicatingy device, a pair of jaw elements adapted to be disposed diametrically upon opposite sides of a shaft, the speed of which is to'be measured, a slid'- in'g rack carrying one of said jaw elements, a second sliding rack, a shaft journaled in the second sliding rack, a friction disk mounted on said shaft, a friction wheel adapted to contact with the friction disk, means for driving said friction wheel from one of said jawelements, and means for simultaneously sliding said racks. A

8. In a speed indicating device, a pair f jaw elements adapted to be disposeddiametrically up'on opposite sides of a shaft, the speed of which is to be measured, a slid'- ing rack carrying one 'of said jaw elements7 a second sliding rack, a shaft journaled in the second sliding rack, a friction disk mounted k0n said shaft, a friction wheel adapted to Contact "with the friction disk,

.means for driving said'friction wheel from one of said jaw elements, means for simultaneous-ly sliding said racks, and spring means forholding the friction disk in contact with the friction wheel.

9. In a speed indicating device, a frame, a pair of jaw elements carried by the frame, a sliding rack for moving one of said jaw elements with respect to the other, the other jaw element being in the form of a friction wheel, a second friction wheel, means for driving said second friction wheel from and at the speed of the first-named friction wheeh a second rack slidable on the frame, a shaft journaled in the second rack, a friction disk carried by said shaft and adapted to contact with the second named friction wheel, means for simultaneously moving said racks.

10. In a speed indicating device, a frame,

a pair of j aw elements carried by the frame7 a sliding rack for movingone of said jaw elements with respect to the other, the other jaw element being in the form'of a friction wheel, a second friction wheel, means Vfor driving said second friction wheel from and at the speed of the first-named friction wheel, a second rack slidable on the frame, a shaft journaled in the second rack, a friction disk carried by said shaft and adapted to contact with the second named friction wheel, gears meshing with respective racks, and means for simultaneously rotating said gears to shift said racks to thereby simultaneously vary the spaced distance of the' jawelements and the point of contact of the friction wheel with the friction disk.

11. A pair of jaw elements adapted to be disposed diametrically upon opposite sides of a shaft, one ofs'aid jaw elements including a rotary member adapted to be driven by the shaft, a measuring shaft and a driv- Y ing connection between said measuring shaft and said rotary member including a friction disk and a friction wheel, and means for effecting a relative adjustment of the fric' disk anda friction wheel, and means for eifecting a relative adjustment of the friction disk and friction wheel radially of the disk simultaneously 'with movement of the jaw elements toward or from each other.

In witness whereof we have hereunto set our hands this 29th day of March, 1926.

Y ARTHUR P. BRANT.` CHARLES M. DERBY.` 

